johnz johnz - 1 year ago 200
iOS Question

Handling CloudKit errors and CKError

This seems elemental but I can't seem to find anyway that leads me in the correct direction.

In my app I have this code to access a CloudKit record:

db.performQuery(query, inZoneWithID: nil) {(results, error) -> Void in
if error != nil {
print("performQuery error on query:\n\(error?.description)")
else {
for rec in results! {
// handle the record

This works, but sometimes I get an error; for example:

<CKError 0x155cfaa0: \"Request Rate Limited\" (7/2008); Retry after 1.9 seconds>

I understand why I get the error, but I do not know how to access the CKError object which has the information I need to wait and retry the operation after - in this case - 1.9 seconds (or whatever has been shown in the message). "error" in the closure is an NSError.

How do I access the CKError record and retrieve the CkErrorCode and retryAfter properties of that so I can gracefully handle the retry?

Sorry if this seems elemental, but I sure have not found anything that explains it.

Answer Source

You should check the userInfo dictionary of the NSError.

    if let retryAfterValue = error.userInfo[CKErrorRetryAfterKey] as? NSTimeInterval {
        let retryAfterDate = NSDate(timeIntervalSinceNow: retryAfterValue)
        // ...
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